Answered by : muhammad-waseem

<?php if(Yii::app()->user->hasFlash('contact')): ?>
<div class="flash-success">	<?php echo Yii::app()->user->getFlash('contact'); ?>
</div>
<?php endif; ?> 

Source : https://www.yiiframework.com/wiki/111/using-setflash-for-displaying-various-kind-of-messages | Last Update : Tue, 27 Oct 20

Answered by : muhammad-waseem

Yii::app()->user->setFlash('contact','Thank you for contacting us. We will respond to you as soon as possible.');

Source : https://www.yiiframework.com/wiki/111/using-setflash-for-displaying-various-kind-of-messages | Last Update : Tue, 27 Oct 20